We use build-container-installer. Last I remember, that had no issues with creating ISOs that use bootc. Just uses a different command in anaconda. @Skynet would know the more technical details there.
Bootc works similarly to rpm-ostree for some things, so there's a lot of commands that will work in both. The main thing I've noticed, is that bootc also allows dnf commands during the images build. I'm sure there's other things, but that's the main one I've noticed